Bug 2495997 (CVE-2026-58379)

Summary:	CVE-2026-58379 gimp: gimp: Heap buffer overflow in read_channel_data()
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	rhel-process-autobot, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
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Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in GIMP's Paint Shop Pro (PSP) file format parser. This heap buffer overflow vulnerability allows a remote attacker to cause arbitrary code execution or a denial of service (DoS) by tricking a user into opening a specially crafted PSP image file. The vulnerability occurs because the software incorrectly calculates buffer sizes when processing low bit-depth images, leading to an overwrite of adjacent memory.	Story Points:	---
Clone Of:		Environment:
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Regression:	---	Mount Type:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-07-01 15:06:14 UTC

A heap buffer overflow write vulnerability exists in GIMP's Paint Shop Pro (PSP) file format parser. In read_channel_data() in file-psp.c, for low bit-depth images (depth=1 or 4), line_width uses a packed formula (8 pixels/byte) but fread() reads width bytes (1 byte/pixel). For example, with width=33 and depth=1: allocates 4 bytes, writes 33 — a 29-byte heap overflow.

This is a variant of CVE-2026-4153 (commit 98cb1371), which fixed read_layer_block() but left the buf allocation in read_channel_data() unpatched.

- Function: read_channel_data()
- File: plug-ins/common/file-psp.c:1558-1784
- Fix: https://gitlab.gnome.org/GNOME/gimp/-/commit/b630f167
- Hardening: https://gitlab.gnome.org/GNOME/gimp/-/commit/20b00d6d
- Upstream issue: https://gitlab.gnome.org/GNOME/gimp/-/issues/16205
- Acknowledgment: bb1abu

Comment 1 errata-xmlrpc 2026-07-13 06:40:07 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:38496 https://access.redhat.com/errata/RHSA-2026:38496